diff --git a/src/generic/dcpsg.cpp b/src/generic/dcpsg.cpp
index 94c2a4993f..f4df4fc183 100644
--- a/src/generic/dcpsg.cpp
+++ b/src/generic/dcpsg.cpp
@@ -2286,13 +2286,15 @@ void wxPostScriptDC::DoGetTextExtent(const wxString& string,
            /  the correct way would be to map the character names
            /  like 'adieresis' to corresp. positions of ISOEnc and read
            /  these values from AFM files, too. Maybe later ... */
-        lastWidths[196] = lastWidths['A'];  // Ä
-        lastWidths[228] = lastWidths['a'];  // ä
-        lastWidths[214] = lastWidths['O'];  // Ö
-        lastWidths[246] = lastWidths['o'];  // ö
-        lastWidths[220] = lastWidths['U'];  // Ü
-        lastWidths[252] = lastWidths['u'];  // ü
-        lastWidths[223] = lastWidths[251];  // ß
+
+        // NB: casts to int are needed to suppress gcc 3.3 warnings
+        lastWidths[196] = lastWidths[(int)'A'];  // Ä
+        lastWidths[228] = lastWidths[(int)'a'];  // ä
+        lastWidths[214] = lastWidths[(int)'O'];  // Ö
+        lastWidths[246] = lastWidths[(int)'o'];  // ö
+        lastWidths[220] = lastWidths[(int)'U'];  // Ü
+        lastWidths[252] = lastWidths[(int)'u'];  // ü
+        lastWidths[223] = lastWidths[(int)251];  // ß
 
         /* JC: calculate UnderlineThickness/UnderlinePosition */